I recently acquired a copy of this beast, as both a curiosity and something I think could be useful (on a sturdy tripod!) for video. With that said, this is an ancient lens that I don't think uses any coatings or anything but straightforward glass elements. Would using a higher-end filter, super-duper-ultra-everything-coated filter do anything for this lens to aid with flare, ghosting, etc, or would having a coated front element do nothing if the remaining elements aren't coated?
I'm not sure if this is correct but I seem to recall that the nano crystal coating at least is only applied to the one element (the front element) of a lens... so would putting a coated filter on the front of this lens have any benefit? I don't think I would spend money on a 95mm filter, but I have good 77mm filters and I can get a step down ring from 95mm to 77mm and on the DX sensor the filter is still out of the image.
If this is something that would not help, I will just find a suitable hood for the lens. I would love to do both a hood and a filter at the same time, but that seems it would require using a 95mm filter, unless I can find a step-down ring that also has a 95mm female thread on the front.